This seems to be a common topic, so perhaps my post is more of a rant but it's so frustrating that I ( we ) have lost the ability to be able to choose the channel. My main Google Account has an Associated YouTube Account/Channel but that has no content, subscribers etc. I have a secondary channel that holds all my content, subscribers list etc. that I've had for years. Even thinking back I don't even know how it ended up that way but it's always how it's been managed.

Since the update on Android TV for the YouTube app, all I can sign in as is my default Google Account, no option to add or choose a channel.

Uninstalled the updates for now, which I'm grateful for the fact that we can do that at least.

/rant